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IObjectActionDelegate + ISelction filtering [message #541171]

Fri, 18 June 2010 14:11

Sebastian

Messages: 26
Registered: July 2009

Junior Member

Hi,

I'd like to have a context menu entry for a specific class (realized
with IObjectActionDelegate) which is only visible if all selected items
match some criteria. The problem is that it is not sufficient to test
how many items are selected (e.g. with enablesFor) or to test every
single item for itself.
For example the action should be enabled if one of the selected items
fullfill a special requirement. Therefore to test for the amount or an
objectState separatly is not sufficient.
Is there any possibility to get a setEnabled-method for a
IObjectContribution?
Or maybe an ISelction for an Action?
Or is there any other possiblity?

Thanks

Sebastian

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Re: IObjectActionDelegate + ISelction filtering [message #541219 is a reply to message #541171]

Fri, 18 June 2010 17:54

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

In general the object contribution filters are applied as an "and".
i.e. every object in the selection must match all criteria. There's
nothing you can do about that.

Even the core expression, objectContribution/enablement, is applied to
each element individually.

If you use commands and org.eclipse.ui.menus to contribute to a popup
menu, you have a lot more flexibility with the visibleWhen clause (<with
variables="activeMenuSelection")

PW

PW

--
Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions
http://wiki.eclipse.org/Menus_Extension_Mapping
http://help.eclipse.org/galileo/index.jsp?topic=/org.eclipse .platform.doc.isv/guide/workbench.htm

Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions

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Re: IObjectActionDelegate + ISelction filtering [message #541478 is a reply to message #541219]

Mon, 21 June 2010 10:01

Daniel KrÃ¼gler

Messages: 853
Registered: July 2009

Senior Member

On 18.06.2010 19:54, Paul Webster wrote:
> In general the object contribution filters are applied as an "and". i.e.
> every object in the selection must match all criteria. There's nothing
> you can do about that.

I believe that would still allow the OP to use a property tester to
check the constraints. If some special item needs some special test,
the only thing the OP needs to be able to *recognice*, which object
is special. So, the test would basically look like:

return ifSpecial(obj) ? checkSpecial(obj) : checkNormal(obj);

Greetings from Bremen,

Daniel Krügler

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Re: IObjectActionDelegate + ISelction filtering [message #541528 is a reply to message #541478]

Mon, 21 June 2010 13:14

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

Daniel Krügler wrote:
>
> return ifSpecial(obj) ? checkSpecial(obj) : checkNormal(obj);
>

Yes, but that test will be applied individually to each element in the
selection. If that's what you want, then you're gold.

It's the case where you want "If most of the selection is normal but
there is at least one special case" that won't work, because you can't
tell how your siblings evaluated.

PW

--
Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions
http://wiki.eclipse.org/Menus_Extension_Mapping
http://help.eclipse.org/galileo/index.jsp?topic=/org.eclipse .platform.doc.isv/guide/workbench.htm

Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions

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Re: IObjectActionDelegate + ISelction filtering [message #541542 is a reply to message #541528]

Mon, 21 June 2010 13:28

Daniel KrÃ¼gler

Messages: 853
Registered: July 2009

Senior Member

On 21.06.2010 15:14, Paul Webster wrote:
> Daniel Krügler wrote:
>>
>> return ifSpecial(obj) ? checkSpecial(obj) : checkNormal(obj);
>>
>
> Yes, but that test will be applied individually to each element in the
> selection. If that's what you want, then you're gold.
>
> It's the case where you want "If most of the selection is normal but
> there is at least one special case" that won't work, because you can't
> tell how your siblings evaluated.

I agree - I misread what the OP actually wants.

Thx,

- Daniel

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